Zoltan Haindrich created HIVE-20502:
---------------------------------------
Summary: Fix NPE while running skewjoin_mapjoin10.q when column
stats is used.
Key: HIVE-20502
URL: https://issues.apache.org/jira/browse/HIVE-20502
Project: Hive
Issue Type: Bug
Components: Statistics
Reporter: Zoltan Haindrich
Assignee: Zoltan Haindrich
Enabling {{hive.stats.fetch.column.stats}} makes this test fail during:
{code}
EXPLAIN
SELECT a.*, b.* FROM T1_n151 a RIGHT OUTER JOIN T2_n88 b ON a.key = b.key
{code}
Seems like joinKeys is null at [this
point|https://github.com/apache/hive/blob/48f92c31dee3983f573f2e66baaa213a0196f1ba/ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java#L2169]
Exception:
{code}
2018-09-04T23:47:02,398 DEBUG [fef236ce-e62e-4c20-b0c0-3b15d2b336f7 main]
annotation.StatsRulesProcFactory: STATS-JOIN[15]: detects none/multiple PK
parents.
2018-09-04T23:47:02,409 ERROR [fef236ce-e62e-4c20-b0c0-3b15d2b336f7 main]
ql.Driver: FAILED: NullPointerException null
java.lang.NullPointerException
at
org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.isJoinKey(StatsRulesProcFactory.java:2169)
at
org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.updateNumNulls(StatsRulesProcFactory.java:2210)
at
org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.updateColStats(StatsRulesProcFactory.java:2276)
at
org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.process(StatsRulesProcFactory.java:1785)
at
org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:90)
at
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatchAndReturn(DefaultGraphWalker.java:105)
at
org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:89)
at
org.apache.hadoop.hive.ql.lib.LevelOrderWalker.walk(LevelOrderWalker.java:143)
{code}
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